Koch, A. 1841b: Description of the Missourium, or Missouri Leviathan; together with its supposed habits. And Indian traditions concerning the location from whence it was exhumed: also, comparisons of the whale, crocodile and Missourium, with the Leviathan, as described in the 41st chapter of the Book of Job. 2nd edition. Prentice and Weissinger, printers, Louisville, KY. Internet ArchiveBHL

Koch, A. 1843: Description of the Missourium Theristocaulodon (Koch) or Missouri Leviathan (Leviathan Missouriensis,) together with its supposed habits, and the Indian Traditions: also, comparison on the Whale, Crcocodile, and Missourium, with the Leviathan, as described in the 41st chapter of the Book of Job. C. Crookes, Dublin. [not seen]